Engine Temperature Sensor Out of Range
The engine temperature sensor is reporting a temperature outside of its normal operating range.
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What it means (plain English)
The engine temperature sensor measures how hot the engine is running. If it shows a value way too high or too low, the engine's computer gets confused and throws a code.
What the computer is actually seeing
The engine control module (ECM) expects the engine coolant temperature (ECT) to be within a certain range, typically from 180°F to 220°F (82°C to 104°C). If the ECM receives a signal outside of this range, it will trigger SPN 2722.
What a healthy reading looks like
Normal ECT values are 180-220°F (82-104°C) and should change according to engine load; over 240°F (116°C) or under 150°F (65°C) may trigger this fault.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Check the engine coolant level; it should be between the minimum and maximum marks on the reservoir. If low, top it off and recheck for codes.
- 22. Visually inspect the wiring and connector to the engine temperature sensor for damage or corrosion. Repair if necessary.
- 33. Use a scan tool to read the current ECT value while the engine is running. If it reads outside 180°F - 220°F (82°C - 104°C), continue checking.
- 44. Measure the resistance at the temperature sensor connector; a typical reading at room temp (70°F/21°C) should be approximately 2,200 ohms. If it's significantly off, replace the sensor.
- 55. If sensor checks out, verify thermostat operation; ensure engine reaches operating temperature (210°F/99°C) in a reasonable time (10-15 mins).
Common causes
- Faulty engine temperature sensor
- Wiring issues (shorts/open circuits)
- Coolant level low or incorrect coolant type
- Thermostat stuck open/closed
- Engine overheating condition
Typical repair cost
$$-$$$
Related codes
Frequently asked questions
Can I drive the vehicle with this code?
It's drivable, but monitor engine temperature closely to avoid overheating.
Will this issue come back after fixing?
If the underlying cause is repaired correctly, it shouldn't reoccur.
Why do I see this code with overheating or cooling issues?
The sensor can't function properly if the engine is actually overheating or if there's a coolant problem.
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